Moeraki Boulders, New ZealandResembling giant turtle shells, these spherical boulders lie strewn on New Zealand's Koekohe Beach.
These boulders started forming in sediments on the sea floor over 60 million years ago. Carbonates built up around a central core, similar to the way pearls form around a speck of grit.
According to Maori legends, the boulders are remnants of gourds and eel baskets, washed ashore from the wreck of a sailing canoe.
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